ON SPECIES OF GASTEROPELECUS. 9 



a brown spot on the anterior rays of the dorsal, and another 

 in the brownish color of the interior or central rays of the 

 pectoral. 



GASTEROPELECUS PECTOROSUS sp. n. 



D. 15-16, A. 36-40, L. 1. 21 (19-22). 



The specimens to which this name is given are readily 

 separated from the preceding by the difference in shape. 

 In those of equal length, when compared with G. stella- 

 tus, G. pectorosus is found to be one-fifth deeper from 

 back of head to lower edge of sternal expansion, the an- 

 terior edge of the latter approaching the vertical and be- 

 ing more nearly straight. Or, if specimens of equal depth 

 are compared, G. stellatus is seen to be one-third the 

 longer. As far as may be determined from the descrip- 

 tion of G. securis, of Filippi, its shape approaches that of 

 G. pectorosus; the former is possessed of a larger num- 

 ber of rays (44) in the anal fin. In the latter the pecto- 

 rals reach farther back than the base of the dorsal. Meas- 

 urements from those taken at Manacapouru make the length 

 of one, to base of caudal, two and one-fourth, and the depth 

 one and seven-eighths inches. Of another, the length is 

 one and seven-eighths inches and the depth one and one- 

 fifth. Secured at Cudajas, Lago Alexo, Obidos, Taba- 

 tinga and Manacapouru. 



GASTEROPELECUS FASCIATUS sp. n. 



G. strigatus St. 

 D. 10, A. 25-27, L.I. 30-32. 



The outline of this fish is similar to that of G. sternicla 

 but it is readily distinguished by its markings. Along 

 the anal margin at the base of the fin there is a narrow 

 band of dark color ; parallel to this and half way to the 

 base of the pectoral there is a broader band of similar color ; 



ESSEX IN8T. BULLETIN, VOL. XXII 1* 



